Converting my 390 Vac sec 4bbl from a metering plate to a metering block. That way I can adjust the sec main jet size. Can anyone help with the equivilant jet size for a metering plate with the numbers 54?9716B so I have a baseline? The question mark in the number is an unreadable charater.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

How old is this carb?

The newer 90's ish carbs just have a number stamped on it like '34'.

The older part number system used to start with '34BP'-XXXX-(two digit plate number).

There is another set of plates that were just stamped '34BP-(4 digit part number).

-D.Idiot

Thanks, DI. The first numbers were 34. When I removed the plate from the carb, I could see it better. Also found the jet size stamped on the plate. Hard to see as it was faint and on a casting line. # 59

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225